Re: OT: Radio Transmission in Water by The Jacky's .

Water conducts sound extremely well , better (and faster) than air. I thinking in a very free form mode here but you could rip the transducers off a couple of old fish finders and use em for tx and rcv. units. I think these guys operate above 30 KHz. You may be able to modulate enough info on to the carrier to do slow frame video. ---------- {Quote hidden}> From: Alessandro Zummo <azummoEraseMEITA.FLASHNET.IT> > To: @spam@PICLIST.....TakeThisOuTMITVMA.MIT.EDU > Subject: Re: OT: Radio Transmission in Water > Date: Friday, March 06, 1998 12:50 PM > > Il 06-Mar-98, Jacques Audette scrisse: > > > I'm usually silent but since i already tought of the dtmf idea a while > > ago for another project and noticed it could not work, i had to say it. > > > The only problem with dtmf is the speed. the detectors cannot lock fast > > enough to get a normal bandwidth (usually a couple of ms). A solution > > would be High Speed DTMF (I heard of it but never looked it up). > > I tought to use dtmf only for driving an r/c submarine, > surely not for other purposes... i could enlarge the tone > duration... anyway i should still evaluate the attenuation > of a sound in the water... if someone knows about > HSDTMF.. would be better :-) > > > -- > > - *Alex* - > > http://freepage.logicom.it/azummo/